Carburetor



Feb. 9-, 1932. u M. KREHER 1,844,771

CARBURETOR Filed July 51,1930

Patented Feb. 9, 1932 UNITED STATES PATENT OFFICE MAX RBI-HER, OI FREIBEBG, GERMANY, ASSIGNOR TO CURT L'UDWIG, OF ANNABEBG, GERMANY OABBURETOR Application filed July 81, 1930, Serial No. 472,097, and in Germany March 27, 1930.

The present invention relates to a carburotor of the floatless type.

Compared with existing types, the carburetor according to the invention is drawn or pressed chiefly from sheet metal instead of employing cast parts, and is further distinguished by light weight, neat shape, and lower cost of production.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a longitudinal section of the carburetor and Figs. 2 to 4 are detail views.

Referring to the drawings, 1 is the cylindrical body provided with the step 2 carrying the flange 3. Attached to the casing 1 is a chamber 4 serving as ante-chamber for the fresh air and being fitted with the removable filtering strainer 5 of large diameter and with the inlet ports 6. The chamber is rotatable so as to draw off air on the colder or warmer side of the motor.

In the central axis of the carburetor a core 7 is provided which is centered by means of the webs 8 and in front of which a closing screw 9 is arranged. The neck of the screw carries the rotatable and universally adjustable inlet connection for the benzine, and this connection 10 is provided in its nave 11 with an annular chamber comprising the strainer 13 and the outlets 12 which open into a risiiiig chamber 14 connected with a duct 15 shut o by a nozzle 16, followed by a duct 17 opening into a connection 18. 19 is an air duct. Within the duct 17 a cushioned valve 21 is located, the spring of this needle valve bearing the reference numeral 20. The valve carries the spray head 22.

The screw-plug 9 is fitted with the notches 23 to which an elastic cap 24 is attached. To the bottom of the cap a regulating pin 25 is secured and provided with a cork packing 26. The pin tapers towards the top to facilitate its removal and return for cleaning and extends in its highest position, which is shown, up to the nozzle 16. Its upper end has a bore from which the lateral ducts 27 extend which are graduated as to size, the upper one having the largest passage and the lower one, the narrowest. If the cap 24 is placed in the upper notch 23, as shown, the lower The benzine travels from the chamber 11 into the chamber 14 and through the lateral ducts 27 into the bore 15 whence it passes through the nozzle 16 and the duct 17 to the sprayer 22. By means of the air piping 19 the benzine is pre-mixed with air, and a second air port 28 serves for regulation during idling.

The space around the core 7 is the suction path for the fresh air, and on this path, within a vertically adjustable sleeve 29, a bush is disposed, the upper portion of which is slotted and constitutes the cage 30. The suction air passes through this cage which can be pressed together by pushing up the sleeve 29 to reduce the passage. The narrower the passage, the higher will be the velocity of the air current and the greater the entraining force of the current. Narrowing is therefore resorted to in case of heavy oils which afiord an opportunity of working at will with poor or rich mixtures.

The needle valve 21 and the sprayer 22 rise automatically according to the strength of the suction stroke so that the quantitive relation between air and benzine never varies. A finger 31 limits the stroke.

I claim 1. Floatless carburetor with sprayer head comprising a cylindrical casing and a rotatable slotted fore-chamber for the suction air connecting with the said casing, the slots of the said chamber being adjustable in Various directions, the parts of the carburetor being chiefly drawn from sheet metal.

2. In a carburetor according to claim 1 a compressible bush having a cage-like upper portion and serving as path for the suction air and means for compressing the said bush to narrow the air passage.

In testimony whereof I have aflixed my signature.

MAX KREHER. 

